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The only generic interface to execute asynchronously in the BH context is tasklet; however, it's marked deprecated and has some design flaws such as the execution code accessing the tasklet item after the execution is complete which can lead to subtle use-after-free in certain usage scenarios and less-developed flush and cancel mechanisms. To replace tasklets, BH workqueue support was recently added. A BH workqueue behaves similarly to regular workqueues except that the queued work items are executed in the BH context. Convert virtio_crypto_core.c from tasklet to BH workqueue. Semantically, this is an equivalent conversion and there shouldn't be any user-visible behavior changes. The BH workqueue implementation uses the same softirq infrastructure, and performance-critical networking conversions have shown no measurable performance impact. Signed-off-by: Pat Somaru <patso@likewhatevs.io> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>